Having greed is good, its the stupid mistakes that make you lose money. Greed is wanting more money, holding more than you should is not "greed", its a mistake, if you know what you are doing then you would sell at the top and buy at the bottom and make more money aka be greedy.
So all in all, do not make all the mistakes confused with each other, because emotions in trading world is very dangerous and mistaking which emotion is which could be even worse and that's an important thing.
I think either emotion and greeds could really affect in decision making towards any investments and should be getting rid of.
so many keep saying that greed and emotions are two different things but the reality is that both could affect in decision making horrendously and could incur losses.
it's always good to make strategy beforehand, after all with that we could avoid being greedy and emotions, calculation based on logic should always takes first place than other else.
that way your decision gonna be the most effective.